DENSIFICATION OF POROUS ALLOY-STEEL PREFORMS AT HIGH-TEMPERATURE

Thermoplastic response and densification behavior of porous alloy stee l preforms under P/M forging are studied at various initial relative d ensities, strain rates and temperatures. Experimental data for porous alloy steel preforms are also compared with several yield functions fr om the literature. To provide a better theoretical prediction with exp erimental data, a new yield function is proposed based on the yield fu nctions of Kim and Shima and Oyane. Finally, plastic response and dens ification behavior of porous alloy steel preforms during P/M forging h ave been investigated by both experiments and finite element calculati ons.